Tackleing the big job before summer!! - Page 3 - ZR-1 Net Registry Forums

yzpilot · 06-02-2014

Ok guys...stage 1 complete! I am really happy how it turned out! What do you all think?? At the risk of this turning to a technical post...since I got it back together it idles a little funny. Shoots up to 2 grand on start up..which I know is sometimes normal..but when it comes down it seems to bounce between 900 and about 1200. Kind of annoying. It didn't do this before. Just purred steady. Also when I come to a stop it stays higher, about 1500?? Any ideas? Thanks guys!!

We Gone · 06-02-2014

Looks great.. You may need to check for a vacuum leak or the IAC. Just a guess I'm sure the guys in the know will post up.

Pete · 06-02-2014

Did you disassemble/reassemble the TB?
Sounds like vacuum leak but check TPS is set correctly.

Pete

XfireZ51 · 06-02-2014

Quote:

Originally Posted by Pete

Did you disassemble/reassemble the TB?
Sounds like vacuum leak but check TPS is set correctly.

Pete

Agree w Pete. Check TPS, AND possibly Min Air Adjustment. Helpful if you have a scan tool. If you disassembled the TB, then he you need to have the throttle blades aligned.

yzpilot · 06-02-2014

Ok, at the suggestion of a good friend, I took off the air boot and (choked it) with a book. Within 2 seconds it died right out. Didn't hear any hissing from vacuum leaks. Pretty much went through a can of carb cleaner over the top end, and got no change in rpm at all. Pulled the IAC and checked for cleanliness, reinstalled. Seemed to idle normal at first then rose back up to a high idle. Checked the TPS setting and was good. Even adjusted a bit but idle only rose, so set back to original position. Guess a plenum pull is in order!:-( What a bummer!

XfireZ51 · 06-02-2014

DID U DISASSEMBLE THE THROTTLE BODY WHEN YOU POWDERCOATED?

yzpilot · 06-02-2014

I did. Whats the procedure for aligning the throttle blades? I try anything before pulling the plenum again!

XfireZ51 · 06-02-2014

Pull off the throttle body and send it to Haibeck.

Schrade · 06-03-2014

Get a sheet of gasket material, and cut out one of these.

If your TB is leaking by 2nd butterflies, then with this in place, idle will hold steady as a rock, and the lope will disappear.

yzpilot · 06-03-2014

Schrade, are you using this in place of the stock gasket?

06-02-2014	#22
We Gone Join Date: Apr 2004 Location: ATL. GA. Posts: 2,170	Re: Tackleing the big job before summer!! Looks great.. You may need to check for a vacuum leak or the IAC. Just a guess I'm sure the guys in the know will post up. __________________ Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold

06-02-2014	#23
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,679	Re: Tackleing the big job before summer!! Did you disassemble/reassemble the TB? Sounds like vacuum leak but check TPS is set correctly. Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

06-02-2014	#25
yzpilot Join Date: Jul 2013 Location: Oceanside, California Posts: 66	Re: Tackleing the big job before summer!! Ok, at the suggestion of a good friend, I took off the air boot and (choked it) with a book. Within 2 seconds it died right out. Didn't hear any hissing from vacuum leaks. Pretty much went through a can of carb cleaner over the top end, and got no change in rpm at all. Pulled the IAC and checked for cleanliness, reinstalled. Seemed to idle normal at first then rose back up to a high idle. Checked the TPS setting and was good. Even adjusted a bit but idle only rose, so set back to original position. Guess a plenum pull is in order!:-( What a bummer! __________________ Erik ________________________ 1991 #422 Blk/Blk

06-02-2014	#26
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,698	Re: Tackleing the big job before summer!! DID U DISASSEMBLE THE THROTTLE BODY WHEN YOU POWDERCOATED? __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

06-02-2014	#27
yzpilot Join Date: Jul 2013 Location: Oceanside, California Posts: 66	Re: Tackleing the big job before summer!! I did. Whats the procedure for aligning the throttle blades? I try anything before pulling the plenum again! __________________ Erik ________________________ 1991 #422 Blk/Blk

06-03-2014	#29
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: Tackleing the big job before summer!! Get a sheet of gasket material, and cut out one of these. If your TB is leaking by 2nd butterflies, then with this in place, idle will hold steady as a rock, and the lope will disappear. __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]